1 /* GDK - The GIMP Drawing Kit
2 * Copyright (C) 2000 Red Hat, Inc.
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 * Modified by the GTK+ Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GTK+ Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.
29 #include "gdkconfig.h"
30 #include "gdkdisplaymanagerprivate.h"
31 #include "gdkinternals.h"
32 #include "gdkmarshalers.h"
37 * SECTION:gdkdisplaymanager
38 * @Short_description: Maintains a list of all open GdkDisplays
39 * @Title: GdkDisplayManager
41 * The purpose of the #GdkDisplayManager singleton object is to offer
42 * notification when displays appear or disappear or the default display
57 static void gdk_display_manager_class_init (GdkDisplayManagerClass *klass);
58 static void gdk_display_manager_set_property (GObject *object,
62 static void gdk_display_manager_get_property (GObject *object,
67 static guint signals[LAST_SIGNAL] = { 0 };
69 G_DEFINE_TYPE (GdkDisplayManager, gdk_display_manager, G_TYPE_OBJECT)
72 gdk_display_manager_class_init (GdkDisplayManagerClass *klass)
74 GObjectClass *object_class = G_OBJECT_CLASS (klass);
76 object_class->set_property = gdk_display_manager_set_property;
77 object_class->get_property = gdk_display_manager_get_property;
80 * GdkDisplayManager::display-opened:
81 * @manager: the object on which the signal is emitted
82 * @display: the opened display
84 * The ::display-opened signal is emitted when a display is opened.
88 signals[DISPLAY_OPENED] =
89 g_signal_new (g_intern_static_string ("display-opened"),
90 G_OBJECT_CLASS_TYPE (object_class),
92 G_STRUCT_OFFSET (GdkDisplayManagerClass, display_opened),
94 _gdk_marshal_VOID__OBJECT,
99 g_object_class_install_property (object_class,
100 PROP_DEFAULT_DISPLAY,
101 g_param_spec_object ("default-display",
102 P_("Default Display"),
103 P_("The default display for GDK"),
105 G_PARAM_READWRITE|G_PARAM_STATIC_NAME|
106 G_PARAM_STATIC_NICK|G_PARAM_STATIC_BLURB));
110 gdk_display_manager_init (GdkDisplayManager *manager)
115 gdk_display_manager_set_property (GObject *object,
122 case PROP_DEFAULT_DISPLAY:
123 gdk_display_manager_set_default_display (GDK_DISPLAY_MANAGER (object),
124 g_value_get_object (value));
127 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
133 gdk_display_manager_get_property (GObject *object,
140 case PROP_DEFAULT_DISPLAY:
141 g_value_set_object (value,
142 gdk_display_manager_get_default_display (GDK_DISPLAY_MANAGER (object)));
145 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
150 #ifdef GDK_WINDOWING_X11
151 extern GType gdk_display_manager_x11_get_type (void);
155 * gdk_display_manager_get:
157 * Gets the singleton #GdkDisplayManager object.
159 * Returns: (transfer none): The global #GdkDisplayManager singleton;
160 * gdk_parse_pargs(), gdk_init(), or gdk_init_check() must have
166 gdk_display_manager_get (void)
168 static GdkDisplayManager *manager = NULL;
172 const gchar *backend;
174 backend = g_getenv ("GDK_BACKEND");
175 #ifdef GDK_WINDOWING_X11
176 if (backend == NULL || strcmp (backend, "x11") == 0)
177 manager = g_object_new (gdk_display_manager_x11_get_type (), NULL);
181 g_error ("Unsupported GDK backend: %s", backend);
183 g_error ("No GDK backend found");
190 * gdk_display_manager_get_default_display:
191 * @manager: a #GdkDisplayManager
193 * Gets the default #GdkDisplay.
195 * Returns: (transfer none): a #GdkDisplay, or %NULL
196 * if there is no default display.
201 gdk_display_manager_get_default_display (GdkDisplayManager *manager)
203 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->get_default_display (manager);
207 * gdk_display_get_default:
209 * Gets the default #GdkDisplay. This is a convenience
211 * <literal>gdk_display_manager_get_default_display (gdk_display_manager_get ())</literal>.
213 * Returns: (transfer none): a #GdkDisplay, or %NULL if there is no default
219 gdk_display_get_default (void)
221 return gdk_display_manager_get_default_display (gdk_display_manager_get ());
225 * gdk_screen_get_default:
227 * Gets the default screen for the default display. (See
228 * gdk_display_get_default ()).
230 * Returns: (transfer none): a #GdkScreen, or %NULL if there is no default display.
235 gdk_screen_get_default (void)
237 GdkDisplay *default_display;
239 default_display = gdk_display_get_default ();
242 return gdk_display_get_default_screen (default_display);
248 * gdk_display_manager_set_default_display:
249 * @manager: a #GdkDisplayManager
250 * @display: a #GdkDisplay
252 * Sets @display as the default display.
257 gdk_display_manager_set_default_display (GdkDisplayManager *manager,
260 GDK_DISPLAY_MANAGER_GET_CLASS (manager)->set_default_display (manager, display);
262 g_object_notify (G_OBJECT (manager), "default-display");
266 * gdk_display_manager_list_displays:
267 * @manager: a #GdkDisplayManager
269 * List all currently open displays.
271 * Return value: (transfer container) (element-type GdkDisplay): a newly
272 * allocated #GSList of #GdkDisplay objects. Free with g_slist_free()
273 * when you are done with it.
278 gdk_display_manager_list_displays (GdkDisplayManager *manager)
280 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->list_displays (manager);
284 gdk_display_manager_open_display (GdkDisplayManager *manager,
287 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->open_display (manager, name);
292 * @atom_name: a string.
293 * @only_if_exists: if %TRUE, GDK is allowed to not create a new atom, but
294 * just return %GDK_NONE if the requested atom doesn't already
295 * exists. Currently, the flag is ignored, since checking the
296 * existance of an atom is as expensive as creating it.
298 * Finds or creates an atom corresponding to a given string.
300 * Returns: the atom corresponding to @atom_name.
303 gdk_atom_intern (const gchar *atom_name,
304 gboolean only_if_exists)
306 GdkDisplayManager *manager = gdk_display_manager_get ();
308 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->atom_intern (manager, atom_name, TRUE);
312 * gdk_atom_intern_static_string:
313 * @atom_name: a static string
315 * Finds or creates an atom corresponding to a given string.
317 * Note that this function is identical to gdk_atom_intern() except
318 * that if a new #GdkAtom is created the string itself is used rather
319 * than a copy. This saves memory, but can only be used if the string
320 * will <emphasis>always</emphasis> exist. It can be used with statically
321 * allocated strings in the main program, but not with statically
322 * allocated memory in dynamically loaded modules, if you expect to
323 * ever unload the module again (e.g. do not use this function in
324 * GTK+ theme engines).
326 * Returns: the atom corresponding to @atom_name
331 gdk_atom_intern_static_string (const gchar *atom_name)
333 GdkDisplayManager *manager = gdk_display_manager_get ();
335 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->atom_intern (manager, atom_name, FALSE);
342 * Determines the string corresponding to an atom.
344 * Returns: a newly-allocated string containing the string
345 * corresponding to @atom. When you are done with the
346 * return value, you should free it using g_free().
349 gdk_atom_name (GdkAtom atom)
351 GdkDisplayManager *manager = gdk_display_manager_get ();
353 return GDK_DISPLAY_MANAGER_GET_CLASS (manager)->get_atom_name (manager, atom);